What is the difference between functional and non-functional requirements in software?
An important procedure to evaluate a system or software project’s success is requirements proper analysis. Functional and non-functional needs are the two main categories into which requirements are typically divided. Functional requirements specify a system’s precise actions or capabilities. Non-functional requirements, on the other hand, outline how the system carries out its functions, emphasizing characteristics like usability, scalability, security, and performance.
What are Functional Requirements?
The end user expressly requests these features as fundamental features that the system must provide. As stipulated in the contract, all of these features must be included in the system.
These are expressed or depicted as the intended output, the operation carried out, and the input to be supplied to the system.
Unlike non-functional needs, these are user-stated criteria that are directly visible in the finished product.
Examples:
- Which features must we include in this system’s design?
- Which edge scenarios, if any, should we take into account when designing?
What are Non-Functional Requirements?
According to the project contract, the system must meet certain quality requirements. Each project has a different level of importance or implementation of these criteria. An alternative name for them is non-behavioral requirements. They address matters such as:
- Portability
- Security
- Reliability
- Scalability
- Maintainability
- Reusability
- Performance
- Flexibility
- Examples:
Each request should be processed with the minimum latency.
The system should be highly valuable.
Functional Vs. Non-Functional Requirements In Software
Go through this section and understand what is the difference between functional and non-functional requirements in software in a more precise way.
| Functional requirements | Nonfunctional Requirments |
| Specifies the functions or tasks that the system should perform. | explains the qualities or properties of the system, or how it should operate. |
| Emphasizes the system’s characteristics and actions. | Emphasizes usability, performance, and other quality characteristics. |
| Outlines the system’s functions and behaviors. | Outlines the limitations or circumstances that the system must function under. |
| Data input/output transaction processing for user authentication. | Reliability, scalability, and security reaction time ability to be maintained. |
In Conclusion
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